Hello, today on a small tour I noticed that as soon as the machine is warm, in the range between 5000 and 6000 revolutions the machine has no power. You notice despite full gas that the engine brake really ensures that you get slower instead of speeding up. After a short stop times with open tank cover driven because the guess was that too little fuel arrives, but unfortunately no improvement. To replace the petrol filter tomorrow, there is something else. What I can control ? Strangely, if I give quite careful gas then I come over the 5-6000 revolutions and can accelerate relatively normally.